wichita.edu
…and services: purchasing and payment forms, including purchase orders, interdepartmental vouchers, interfund vouchers (IFV), payment vouchers (agency payment vouchers (APV) and business procurement card (BPC) vouchers), travel reimbursement documents, and all supplemental documentation, including invoices and vendor certification forms, such as Form W-9, …
https://www.wichita.edu/about/policy/records_retention_schedule.php